Will the diskbrakes/spindle from a 77 Malibu fit on a 71 Chevelle. What if any modifications will I have to make?

Thanks in Advance

Tee

The '73 upChevelle spindles are referred to as "tall spindles". They can be made to work but it is not a simple task. Here is a link:
http://www.chevelles.com/techref/ftecref2.html
Paul